Feb 12 14:29:14 localhost pulseaudio[4094]: Key code=115, value=1
Feb 12 14:29:14 localhost pulseaudio[4094]: The reference volume of sink sink.sun50i changed from front-left: 58992 /  90% / -2.74 dB,   front-right: 58992 /  90% / -2.74 dB to
 front-left: 62268 /  95% / -1.33 dB,   front-right: 62268 /  95% / -1.33 dB.
Feb 12 14:29:14 localhost pulseaudio[4094]: Storing volume/mute for device+port sink:sink.sun50i:[Out] Headphone.
Feb 12 14:29:18 localhost pulseaudio[4094]: Key code=114, value=1
Feb 12 14:29:18 localhost pulseaudio[4094]: The reference volume of sink sink.sun50i changed from front-left: 62268 /  95% / -1.33 dB,   front-right: 62268 /  95% / -1.33 dB to
 front-left: 58992 /  90% / -2.74 dB,   front-right: 58992 /  90% / -2.74 dB.
Feb 12 14:29:18 localhost pulseaudio[4094]: Storing volume/mute for device+port sink:sink.sun50i:[Out] Headphone.
Feb 12 14:29:19 localhost pulseaudio[4094]: Key code=115, value=1
Feb 12 14:29:19 localhost pulseaudio[4094]: The reference volume of sink sink.sun50i changed from front-left: 58992 /  90% / -2.74 dB,   front-right: 58992 /  90% / -2.74 dB to
 front-left: 62268 /  95% / -1.33 dB,   front-right: 62268 /  95% / -1.33 dB.
Feb 12 14:29:19 localhost pulseaudio[4094]: Storing volume/mute for device+port sink:sink.sun50i:[Out] Headphone.
Feb 12 14:29:20 localhost pulseaudio[4094]: Key code=114, value=1
Feb 12 14:29:20 localhost pulseaudio[4094]: The reference volume of sink sink.sun50i changed from front-left: 62268 /  95% / -1.33 dB,   front-right: 62268 /  95% / -1.33 dB to
 front-left: 58992 /  90% / -2.74 dB,   front-right: 58992 /  90% / -2.74 dB.
Feb 12 14:29:20 localhost pulseaudio[4094]: Storing volume/mute for device+port sink:sink.sun50i:[Out] Headphone.